1 files changed, 104 insertions, 0 deletions
diff --git a/src/librbd/plugin/WriteLogImageCache.cc b/src/librbd/plugin/WriteLogImageCache.cc
new file mode 100644
index 000000000..308bb6a00
--- /dev/null
+++ b/src/librbd/plugin/WriteLogImageCache.cc
@@ -0,0 +1,104 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "ceph_ver.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "common/PluginRegistry.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/cache/WriteLogImageDispatch.h"
+#include "librbd/cache/ImageWriteback.h"
+#include "librbd/cache/Utils.h"
+#include "librbd/cache/pwl/DiscardRequest.h"
+#include "librbd/cache/pwl/InitRequest.h"
+#include "librbd/io/ImageDispatcherInterface.h"
+#include "librbd/plugin/WriteLogImageCache.h"
+
+extern "C" {
+
+const char *__ceph_plugin_version() {
+  return CEPH_GIT_NICE_VER;
+}
+
+int __ceph_plugin_init(CephContext *cct, const std::string& type,
+                       const std::string& name) {
+  auto plugin_registry = cct->get_plugin_registry();
+  return plugin_registry->add(
+    type, name, new librbd::plugin::WriteLogImageCache<librbd::ImageCtx>(cct));
+}
+
+} // extern "C"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::plugin::WriteLogImageCache: " \
+                           << this << " " << __func__ << ": "
+
+namespace librbd {
+namespace plugin {
+
+template <typename I>
+void WriteLogImageCache<I>::init(I* image_ctx, Api<I>& api,
+                                 cache::ImageWritebackInterface& image_writeback,
+                                 PluginHookPoints& hook_points_list,
+                                 Context* on_finish) {
+  bool pwl_enabled = librbd::cache::util::is_pwl_enabled(*image_ctx);
+  if (!pwl_enabled || !image_ctx->data_ctx.is_valid()) {
+    on_finish->complete(0);
+    return;
+  }
+
+  auto cct = image_ctx->cct;
+  ldout(cct, 5) << dendl;
+
+  auto hook_points = std::make_unique<WriteLogImageCache::HookPoints>(
+      image_ctx, image_writeback, api);
+  hook_points_list.emplace_back(std::move(hook_points));
+  
+  on_finish->complete(0);
+}
+
+template <typename I>
+WriteLogImageCache<I>::~WriteLogImageCache() {
+}
+
+template <typename I>
+WriteLogImageCache<I>::HookPoints::HookPoints(
+    I* image_ctx, cache::ImageWritebackInterface& image_writeback,
+    plugin::Api<I>& plugin_api)
+  : m_image_ctx(image_ctx), m_image_writeback(image_writeback),
+    m_plugin_api(plugin_api)
+{
+}
+
+template <typename I>
+WriteLogImageCache<I>::HookPoints::~HookPoints() {
+}
+
+template <typename I>
+void WriteLogImageCache<I>::HookPoints::acquired_exclusive_lock(
+    Context* on_finish) {
+  cache::pwl::InitRequest<I> *req = cache::pwl::InitRequest<I>::create(
+    *m_image_ctx, m_image_writeback, m_plugin_api, on_finish);
+  req->send();
+}
+
+template <typename I>
+void WriteLogImageCache<I>::HookPoints::prerelease_exclusive_lock(
+    Context* on_finish) {
+  m_image_ctx->io_image_dispatcher->shut_down_dispatch(
+    io::IMAGE_DISPATCH_LAYER_WRITEBACK_CACHE, on_finish);
+}
+
+template <typename I>
+void WriteLogImageCache<I>::HookPoints::discard(
+    Context* on_finish) {
+  cache::pwl::DiscardRequest<I> *req = cache::pwl::DiscardRequest<I>::create(
+    *m_image_ctx, m_plugin_api, on_finish);
+  req->send();
+}
+
+} // namespace plugin
+} // namespace librbd
+
+template class librbd::plugin::WriteLogImageCache<librbd::ImageCtx>;